private void Button_Click_2(object sender, RoutedEventArgs e)
 {
     //go to main woindow
     MainWindow w = new MainWindow();
     w.Show();
     this.Close();
 }
 private void Button_Click_2(object sender, RoutedEventArgs e)
 {
     //todo : go home page
     //todo : go to homepage
     MainWindow w = new MainWindow();
     w.Show();
     this.Close();
 }